Anyone know of good Yoga DVDs?

I currently do Yoga on a Monday and Tuesday night before my Muay Thai sessions but i'd like to practice more at home. I find that my kicks are a lot more powerful and fluent on a Monday and Tuesday due to the Yoga, something which doesn't reflect so much in my Wednesday and Thursday sessions.

However i forget the asanas i've done in the lesson and would like an easy to follow DVD that can show me begginer to intermediate techniques. Does anybody know of any good ones as there are a lot out there and i don't want to waste money on rubbish!

I do Hatha Yoga by the way and my aim is to improve core strenght and flexibility for my kicking and grappling.

Also, do any of you have any particularly useful websites that have video clips or pictures?

whatever video you do get, make sure it's ashtanga yoga. it's more intense than any other yoga i've tried and if you REALLY want to improve your flexibility and core strength, this'll do it for you (and quickly!).

(i know you asked for a specific video, but i have to whore off ashtanga at least once a day or else my life is incomplete)

any power yoga, is good, really. most of them are based on ashtanga...but there's not much variety in ashtanga because it's just the same series over and over and over (and over) again until you're good enough to move into the other series (takes forever). so you might want to see if you can find a class with the vinyasa sequence or look up some poses and incorporate them into your practice to spice it up a bit.